Electric plug



June 6, 1939- H.. HUMMEL v 2,161,353

-ELEGTRIG PLUG Filed April :50, 1937 12 INVENTQR.

H9777 leam/mef` BY ATTORNEY'.

Patented June 6,

momo PLUG- Henry Hummel,l New York, N. Y.' l application april so, 1931, sex-u1 No. 139.864

1 claim. loamasn My invention relates to improvements inelectric plugs, and it is the principal object of my invention to provide .a plug Vpermitting a gradual and smooth detachment of the plug from its socket without the necessity of exerting undue strain on the connection, and avoiding the danv ger of causing-short circuits and danger to property or iniuryto persons.

Another object of my invention is the provi-v sion of an electric plug of comparatively simple and inexpensive construction, yet durable and highly eillcient in use.

A further object of my invention is the provision of an electric plug composed ofthe least possible number of parts molded from any suitable insulating material, and held together and locked by a simple split spring ring readily operated to hold the parts together.

A still further object of my invention is the provision of an electric plug provided with a revolving. preferably knurled part co-operating with the plug body to eil'ect the removal of the plug from its socket by the least number of turns either to the left or right by the suitable selection of the number and slant of the interengaging teeth on plug body and'said revolving part. These and other objects and advantages of my invention will becomemore fully known as the description thereof proceeds, and will then kbe '3o specifically deiined 'in the appended claim.

In the accompanying drawing forming a material part of this disclosure:

Flg.`1 is a perspective view of an electric plug yconstructed according to my invention.

Fig. 2 is a fragmentary vertical section through the revolving part and body of the plug proper. Fig. 3 is a top plan view of the revolving part. Fig. 4 is a vertical front elevation of the plug.

Fig. 5 is a top plan view of the plug.

ll'lg. 6 is a detail view of'a split ring for co necting the revolving part with the plug body.

As illustrated, the body I of the plug is located within a revolving tube part 2, the outer face of -which is preferably knurled for facilia tating its operation. The tube 2 is provided with a plurality of teeth 6 on its inner face adapted to bee'ngagedbysimilarteeth8ofasuitablyse-V lected -slant formedV with the plug body i, and nearitsupperfaoethetubelisprovidedwith an annular groove -1 for the reception ofthe spring, split ring I2 holding tube and body in .their relative positions.

The plug body is equipped with the usual terminal prongs 3 secured thereto by means of the screws ill, Il while the foot plates of said prongs are equipped with the screws Il, ilv for the atta'chment of the strands of the electrical cable or cord. l passed through the central opening 9 in the plug. v

In operation, the plug`is placed into the revolving tube 2 and locked to the same by means of the split and elastic ring i2 entered into the groove 'l without however interfering with the revolution of the tube, and it will be clear that either a right or left hand turn given to the tube vby virtue of the riding of the teeth of the tube along the slant of the teeth of the plug body will gradually produce a pulling eiect to pull the plug smoothly out'of its outlet socket 5 so that no undue strain will be exerted on the connections and the danger of short circuits will be positively avoided.

- It will be understood that I have described the preferred form of my invention only, and that I may make such changes in its construction as `come within the scope of the appended claim without departing from lthe spirit of the invention. l

Having thus described my invention. what I claim as new, and desire to secure by Letters- Patent is:

In an electric plug as described, a substantially cup-shaped cable and terminals carrying body having a plurality of teeth of' a suitably selected slant formed stone of its ends, a grooved, revolving tubular member for the reception of said body to revolve about the same in either direction, and having a plurality of teeth formed on its inner face of a slant similar to the slant of the body teeth and co-operating therewith during the revolution ofv said Atubular member in either direction to gradually separate said cable and terminals carrying body from an'outlet socket, and a split ring in the groove of said tubular Amember said body to hold said body and tubular member in their relative positions.

I l may 

